Improvement in compensating-pendulums



UNITED STATES PATENT OFFICE.

EBEN M. GORWIN, OF BARRY, ILLINOIS.

IMPROVEMENT IN COMPENSATlNG-PENDULUMS.

Specification forming part of Letters Patent No. 185,016, dated December 5, 1876; application filed October 30, 1876.

To all whom it may concern:

Be it known that I, EBEN MERToN 00R- WIN, of Barry, in the county of Pike and State of Illinois, have invented a new and Improved Compensating-Bendulum, of which the following is a specification Figure 1 is a front view of the pendulum ball or weight. Fig. 2 is a vertical section on line X. Fig. 3 is a horizontal section on line Y.

Similar letters of reference indicate correspondiu g parts. t

In this invention the variations of the length of the suspendingrod or pendulum-wire B, due to different temperatures, are compensated by placing between the ball A and its supporting and regulating nut B a piece of hard rubber, (l, which, being secured to the ball A by the screw, pin, or projection G at one end, and resting upon the regulating-nut B at the other, keeps the center of gravity of the ball A at a uniform distance from the point of suspension or commencement of motion.

For this purpose the length of the hard rubber between G and B is proportioned to the length of the metal from B to the point of suspension, exactly in the inverse ratio of the expansions of the two substances at equal temperatures. The ball A and rubber O are suspended by the wire B and regulatingscrew and nut B in the usual manner. The

wire B is a portion of the suspending-rod, and the loop and corresponding hook may be dispensed with,and the nut B screwed upon the rod itself, if desired. The nut 13 is provided with a set-screw, B to prevent accidental displacement after the clock has been regulated. The ball A has a metallic sheath or case, A, which protects and guides the rubber G and wire B. The ball A is shown annular in form, but may be made of any suitable form or ma terial.

The hard rubber C may be flat, as shown, or square or cylindrical, solid or hollow, as may be preferred.

Having thus described my invention, Iclaim as new and desire to secure by Letters Patent- 1. The combination of the hard rubber O with the suspending-rod B and ball A, sub stantially as and for the purposes set forth.

2. The combination of the hard rubber G with the ball A and protecting-sheath A, substantially as herein shown and described.

3. The combination of the set-screw B with the regulating-nut B and wire B, as herein shown and described.

EBEN MERTON GORWIN.

Witnesses:

GEo. A. FERGUSON, O. R. EMERSON. 

